Abstract
As a measure of entanglement of three-partite pure state, the distance between this state and a set of fully disentangled states is considered. This distance can be calculated for W-class three-qubit pure states and generalized GHZ-states in explicit analytical form. For general multipartite pure states, the distance up to the set of 1-disentangled states is derived. This value can be considered as a low bound for the entanglement of multipartite pure state.
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